Teardowns › Pricing & paywalls › Reference price

Slack shows the full price struck through next to the intro price

Slack · Pricing · Teams comparing plans · slack.com · captured 16 Oct 2026

ConditionalReference price Social proof

Slack Pricing, captured 16 Oct 2026 — Our capture, 16 Oct 2026, logged out.

Step by step

1
Paid plans carry "50% OFF FOR THREE MONTHS*".
2
Pro shows "$US8.75" struck through next to "$US4.38 per user/month, when paying monthly".
3
Business+ carries a "BEST VALUE" badge.
4
Customer logos sit under the headline "Choose a paid subscription that's built for businesses".

Prices quoted in dollars ($), exactly as shown on the page we captured. Prices vary by region and change over time.

The psychology

Why it nudges

Slack uses a reference price: the struck-through full price is the comparison point for judging the discounted one. The logo strip adds social proof. We captured this on 16 Oct; an earlier visit showed monthly vs annual per-user pricing instead, so Slack's offers change. Results are not public.

● Strong evidence · More on reference price, with sources →

Context

A B2B collaboration tool selling to teams on its public pricing page, with prices in US dollars when we visited. A three-month discount is likely aimed at moving free teams to paid.

Honest nudge or dark pattern?

Conditional

Honest nudge if $8.75 is the real price after three months. Inflated 'was' prices would be deceptive.

Steal this, honestly

When you run an intro offer, show the real full price struck through next to it.
Say exactly how long the discount lasts, next to the price.
Put recognisable customer logos near the plan cards.

What to test: Discounted price shown alone vs next to the struck-through full price. Measure paid conversions and churn after month 3.

Next: run it on your product

Apply this with your agent

Take the steps above into your own flow. The prompt carries this teardown, the honest-vs-dark line and the steps.

You are helping me apply a behavioural-design pattern ethically.

Pattern: Slack: Slack shows the full price struck through next to the intro price
Bias: Reference price: A price is judged against a comparison price: a 'was' price, a monthly rate, a renewal rate.
Why it nudges: Slack uses a reference price: the struck-through full price is the comparison point for judging the discounted one. The logo strip adds social proof. We captured this on 16 Oct; an earlier visit showed monthly vs annual per-user pricing instead, so Slack's offers change. Results are not public.
Our verdict: Conditional. Honest nudge if $8.75 is the real price after three months. Inflated 'was' prices would be deceptive.
Source page: https://nudgeswipe.com/examples/slack-strikethrough-intro-price/ (JSON: https://nudgeswipe.com/api/teardowns/slack-strikethrough-intro-price.json)

Rules: say a brand "uses" a tactic, never that it "worked"; outcomes are not public unless the company published them; no invented uplift estimates; flag mixed evidence. Honest nudge = true, visible, easy to reverse, and in the user's interest. Dark pattern = hides costs, fakes scarcity or popularity, shames, or makes leaving harder than joining. Quote company-published results as "X reports", with the source link, and don’t generalise them. Don’t cite retracted or failed-to-replicate studies as support (e.g. Ariely & Wertenbroch 2002). Don’t state study figures unless they’re on this page or in a source you can link. If an idea crosses the line, link the matching deceptive.design pattern.

Tasks:
1. Ask me for my product, the flow (URL or screenshots) and the goal.
2. Audit where this pattern already appears, or could, in that flow.
3. Propose 2-3 ethical experiments: hypothesis, variant copy or UI, primary metric, and a guardrail metric (refunds, complaints, cancellations).
4. Flag every dark-pattern risk and say how to stay on the honest side.

Open in ChatGPT Open in Claude Open in Grok Open in Cursor

ChatGPT, Claude, Grok and Cursor open with the prompt filled in (it is also copied, in case the prefill doesn't load). Gemini and Codex don't support prefilled links, so the prompt is copied and the app opens; paste it in.

Sources

Our capture of slack.com, 16 Oct 2026
Kalyanaram & Winer (1995), Empirical generalizations from reference price research. doi.org/10.1287/mksc.14.3.G161

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